Approximately _____ percent of the world population suffers from schizophrenia at some point in their life.

In a single-case design when no treatment is being administered, the observations are called ____ observations

a. no-treatment b. baseline c. treatment d. random

In Eysenck's theory, all of the following go together EXCEPT

a. extroversion. b. neuroticism. c. source and surface. d. psychoticism. e. bipolar dimensions.